Skip to Content


Pronunciation: mak'ro-nu'kle-us


  1. A nucleus that occupies a relatively large portion of the cell, or the larger nucleus where two or more are present in a cell.
  2. The larger of the two nuclei in ciliates, which governs vegetative metabolic functions and not reproduction.

Synonym(s): meganucleus

See Also: micronucleus2

Disclaimer: This site is designed to offer information for general educational purposes only. The health information furnished on this site and the interactive responses are not intended to be professional advice and are not intended to replace personal consultation with a qualified physician, pharmacist, or other healthcare professional. You must always seek the advice of a professional for questions related to a disease, disease symptoms, and appropriate therapeutic treatments.
© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.